bug#58434: Native compile results in error if -march and -mtune are specified

[Eli Zaretskii]

> Date: Wed, 12 Oct 2022 09:13:34 +0200
> Cc: 58434@debbugs.gnu.org
> From: Loreno Heer <loreno.heer@bluewin.ch>
> 
> > OK, so I guess the only problem is that the compiler doesn't support
> > "-march=native", and needs a specific architecture instead of a
> > generic one.
> 
> Yes, but there might be some disadvantages of specifying the
> architecture directly. For example cache sizes are not supplied.
> (https://stackoverflow.com/questions/5470257/how-to-see-which-flags-march-native-will-activate?noredirect=1&lq=1)

What can Emacs do about this?  The problem seems to be between you and
libgccjit/GCC you have installed.  The rejection comes from there, not
from Emacs, AFAIU.